By having giving the money to his kids through gretchen and elliot, having that machine gun set up perfectly outside the clubhouse, and sneakily slipping the ricin into lydia's tea that she always has, walt just shows what a great mastermind he is. Marie, you were dead wrong on that one. I also liked that Walt finally told Skylar the "real" reason why he did all of this. Not for the family but because he felt alive. He was finally able to get closure with her. And of course the best part was helping out his partner one last time and setting him free from his torment. He accomplished everything he set out to do and was able to die with his mind at ease.